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A 2nd Order Harmonic Compensation Method for Wind Power System Using a PR Controller
Hae-Gwang Jeong,이교범,Jong-Hyun Lee 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.3
This paper proposes a compensation method for the 2nd-order harmonic of single-phase grid-connected wind power generation systems. Theoretically, a single-phase grid-connected inverter system has no choice but to cause the 2nd-order harmonic to DC-link voltage. The reference active current is affected by the DC-link voltage. The output current from the reference active current is distorted by the 1st and 3rd-order harmonic. The proposed method can compensate, conveniently, the reference active current with the 2nd-order harmonic. To reduce the 2nd-order ripple in the reference active current, proposed method takes a PR controller as a feed-forward compensator. PR controllers can implement selective harmonic compensation without excessive computational requirements; the use of these controllers simplifies the method. Both the simulation and experimental results agree well with the theoretical analysis.
Controller Design for a Quick Charger System Suitable for Electric Vehicles
Jeong, Hae-Gwang,Lee, Kyo-Beum The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.5
This paper proposes a new design for quick battery charger systems for electric vehicles that consists of a three-phase inverter and a full-bridge converter which use the phase-shift method. The 3-phase inverter controls the input and DC-link voltage by use of a current controller and a voltage controller. The full-bridge converter transfers the DC-link voltage to a fixed output voltage. Designs for the output-side converter and controller for improved performance are proposed in this paper. Design schemes for the filter and controller of an input-side inverter are also presented. Furthermore, the paper proposes a compensation method for the offset current that is caused by switch failure and circuit problems. Simulations and experiments have been performed on a 50kW-battery charger system that is suitable for vehicles. The presented results verify the validity of the proposed method and the superiority of the system over conventional methods.
Controller Design for a Quick Charger System Suitable for Electric Vehicles
Hae-Gwang Jeong,Kyo-Beum Lee 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.5
This paper proposes a new design for quick battery charger systems for electric vehicles that consists of a three-phase inverter and a full-bridge converter which use the phase-shift method. The 3-phase inverter controls the input and DC-link voltage by use of a current controller and a voltage controller. The full-bridge converter transfers the DC-link voltage to a fixed output voltage. Designs for the output-side converter and controller for improved performance are proposed in this paper. Design schemes for the filter and controller of an input-side inverter are also presented. Furthermore, the paper proposes a compensation method for the offset current that is caused by switch failure and circuit problems. Simulations and experiments have been performed on a 50kW-battery charger system that is suitable for vehicles. The presented results verify the validity of the proposed method and the superiority of the system over conventional methods.
A 2<SUP>nd</SUP> Order Harmonic Compensation Method for Wind Power System Using a PR Controller
Hae-Gwang Jeong,Jong-Hyun Lee,Kyo-Beum Lee 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.3
This paper proposes a compensation method for the 2<SUP>nd</SUP>-order harmonic of single-phase grid-connected wind power generation systems. Theoretically, a single-phase grid-connected inverter system has no choice but to cause the 2<SUP>nd</SUP>-order harmonic to DC-link voltage. The reference active current is affected by the DC-link voltage. The output current from the reference active current is distorted by the 1st and 3<SUP>rd</SUP>-order harmonic. The proposed method can compensate, conveniently, the reference active current with the 2<SUP>nd</SUP>-order harmonic. To reduce the 2<SUP>nd</SUP>-order ripple in the reference active current, proposed method takes a PR controller as a feed-forward compensator. PR controllers can implement selective harmonic compensation without excessive computational requirements; the use of these controllers simplifies the method. Both the simulation and experimental results agree well with the theoretical analysis.
A Controller Design for a Stability Improvement of an On-Board Battery Charger
Hae-Gwang Jeong,Kyo-Beum Lee 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
This paper proposes the controller design for a stability improvement of an on-board battery charger. The system is comprised of a power factor correction (PFC) circuit and phase shift full-bridge DC-DC converter. The PFC circuit performs the control of the DC-link voltage and the input power factor. The DC-DC converter regulates the voltage and the current in the battery using the DC-link voltage. This paper proposes the design method of PI controller for the PFC circuit using a small signal model. The analysis and design of a type-three controller for the DC-DC converter is also presented. A simulation and experiment has been performed on the on-board battery charger and their results are presented to verify the validity of the proposed system.
Design of an LCL-Filter for Three-Parallel Operation of Power Converters in Wind Turbines
Jeong, Hae-Gwang,Yoon, Dong-Keun,Lee, Kyo-Beum The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3
This paper proposes a design scheme for an LCL-filter used for the three-parallel operation of the power converters in high-capacity wind turbines. The designs of the power devices and grid connected filter are difficult due to the high level voltages and currents in huge-capacity wind turbines. To solve these problem, this paper presents three-parallel operation and LCL-filter design techniques optimized by parallel operation. Furthermore, the design of an inverter side inductance of the LCL-filter is discussed in detail considering the switching modulation method. Simulation and experimental results demonstrate the validity of the designed filter and wind turbines.
A 2<sup>nd</sup> Order Harmonic Compensation Method for Wind Power System Using a PR Controller
Jeong, Hae-Gwang,Lee, Jong-Hyun,Lee, Kyo-Beum The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.3
This paper proposes a compensation method for the $2^{nd}$-order harmonic of single-phase grid-connected wind power generation systems. Theoretically, a single-phase grid-connected inverter system has no choice but to cause the $2^{nd}$-order harmonic to DC-link voltage. The reference active current is affected by the DC-link voltage. The output current from the reference active current is distorted by the $1^{st}$ and $3^{rd}$-order harmonic. The proposed method can compensate, conveniently, the reference active current with the $2^{nd}$-order harmonic. To reduce the $2^{nd}$-order ripple in the reference active current, proposed method takes a PR controller as a feed-forward compensator. PR controllers can implement selective harmonic compensation without excessive computational requirements; the use of these controllers simplifies the method. Both the simulation and experimental results agree well with the theoretical analysis.
A Controller Design for a Stability Improvement of an On-Board Battery Charger
Jeong, Hae-Gwang,Lee, Kyo-Beum The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
This paper proposes the controller design for a stability improvement of an on-board battery charger. The system is comprised of a power factor correction (PFC) circuit and phase shift full-bridge DC-DC converter. The PFC circuit performs the control of the DC-link voltage and the input power factor. The DC-DC converter regulates the voltage and the current in the battery using the DC-link voltage. This paper proposes the design method of PI controller for the PFC circuit using a small signal model. The analysis and design of a type-three controller for the DC-DC converter is also presented. A simulation and experiment has been performed on the on-board battery charger and their results are presented to verify the validity of the proposed system.
Characteristics of East Asian Passiflora virus isolates from passion fruits in Korea
Jeong-Eun Kim,Su-Bin Hong,Hyeon-Yong Choi,Mikyeong Kim,E-Seul Baek,Hae-Ryun Kwak,Min-kyeong Choi,Hyo-jeong Kim,Hyo-jeong Kim,Hyo-Jung Kang,Jong-woo Han,Heon-sub won,Ji-gwang Kim,Hyeon-ju Lee,Chang-Seo 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.10
Design of an LCL-Filter for Three-Parallel Operation of Power Converters in Wind Turbines
Hae-Gwang Jeong,Dong-Keun Yoon,Kyo-Beum Lee 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3
This paper proposes a design scheme for an LCL-filter used for the three-parallel operation of the power converters in high-capacity wind turbines. The designs of the power devices and grid connected filter are difficult due to the high level voltages and currents in huge-capacity wind turbines. To solve these problem, this paper presents three-parallel operation and LCL-filter design techniques optimized by parallel operation. Furthermore, the design of an inverter side inductance of the LCL-filter is discussed in detail considering the switching modulation method. Simulation and experimental results demonstrate the validity of the designed filter and wind turbines.